Why is the shape of high voltage feedthrough bushings important for insulation?

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SUMMARY

The shape of high voltage feedthrough bushings is critical for effective insulation, primarily due to three electrical factors: Creep, Strike, and Uniform Voltage Gradient. Creep refers to the surface distance from the conductor to the mounting flange, influencing the design of the bushing's skirts. Strike denotes the air distance from the conductor to the flange, affecting the overall size and length of the bushing. Uniform Voltage Gradient ensures that the voltage distribution within the insulating material remains stable, preventing breakdown over time, which is why a conical shape is utilized.

PREREQUISITES
  • Understanding of high voltage electrical systems
  • Familiarity with ceramic insulation materials
  • Knowledge of electrical creep and strike concepts
  • Awareness of voltage gradient principles
NEXT STEPS
  • Research the properties of ceramic materials used in high voltage applications
  • Study the impact of environmental factors on electrical creep
  • Explore design considerations for high voltage bushings
  • Learn about voltage gradient calculations in insulating materials
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Electrical engineers, high voltage system designers, and professionals involved in insulation material selection and bushing design will benefit from this discussion.

LimJH95
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Why does high voltage feedthrough have a ceramic insulation. What would happen without that insulation?
Why is it shaped like conical like a tree?
 
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I am assuming you man something line http://pimg.tradeindia.com/00018889/b/0/HV-Bushing-.jpg - in the US we refer to this item as a bushing. There are three major electrical factors at work, Creep: the distance along the SURFACE from the conduct to the mount ( flange or ground - but the surface you are going through) - thus the skirts - depends on environment. Next is Strike - this is the THROUGH THE AIR distance from the conductor to mounting flange resulting in the overall size / length of the bushing. Lastly and less known is uniform voltage gradient - this is how the Voltage gradient inside the insulating material is spread between the conductor and the flange, the higher the voltage the more important this becomes.. This ensures the insulation material does not break down over time, and is the main reason for the cone shape.
 

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